fixes for block quotations and definition lists

1. block quotations may contain multiline elements like pandocEmphasis
   in which case these elements must neglect quotation markers

2. ordered lists may override definition lists if terms begin from
   digits with dots: this is not what is normally expected. Solution is
   to move definition of definition lists which have richer syntax
   below definition of ordered lists

3. minor fixes for definition lists (term cannot have more than two
   empty lines below etc.)

(see images to the pull request)

Author: lyokha

syntax/pandoc.vim

@@ -225,6 +225,7 @@ syn match pandocTitleBlockTitle /\%^%.*\n/ contained containedin=pandocTitleBloc
 " Blockquotes: {{{2
 "
 syn match pandocBlockQuote /^\s\{,3}>.*\n\(.*\n\@1<!\n\)*/ contains=@Spell,pandocEmphasis,pandocStrong,pandocPCite,pandocSuperscript,pandocSubscript,pandocStrikeout,pandocUListItem,pandocNoFormatted skipnl
+syn match pandocBlockQuoteMark /\_^\s\{,3}>/ contained containedin=pandocEmphasis,pandocStrong,pandocPCite,pandocSuperscript,pandocSubscript,pandocStrikeout,pandocUListItem,pandocNoFormatted
 
 " }}}
 " Code Blocks: {{{2
@@ -406,12 +407,6 @@ syn match pandocFootnoteID /\[\^.\{-}\]/ contained containedin=pandocFootnoteBlo
 call s:WithConceal("footnote", 'syn match pandocFootnoteIDHead /\[\^/ contained containedin=pandocFootnoteID', 'conceal cchar='.s:cchars["footnote"])
 call s:WithConceal("footnote", 'syn match pandocFootnoteIDTail /\]/ contained containedin=pandocFootnoteID', 'conceal')
 " }}}
-" Definitions: {{{2
-"
-syn region pandocDefinitionBlock start=/^\%(\_^\s*\([`~]\)\1\{2,}\)\@!.*\n\(^\s*\n\)*\s\{0,2}[:~]\(\~\{2,}\~*\)\@!/ skip=/\n\n\zs\s/ end=/\n\n/ contains=pandocDefinitionBlockMark,pandocDefinitionBlockTerm,pandocCodeBlockInsideIndent,pandocEmphasis,pandocStrong,pandocStrongEmphasis,pandocNoFormatted,pandocStrikeout,pandocSubscript,pandocSuperscript,pandocFootnoteID,pandocReferenceURL,pandocReferenceLabel,pandocLaTeXMathBlock,pandocLaTeXInlineMath,pandocAutomaticLink,pandocEmDash,pandocEnDash keepend 
-syn match pandocDefinitionBlockTerm /^.*\n\(^\s*\n\)*\(\s*[:~]\)\@=/ contained contains=pandocNoFormatted,pandocEmphasis,pandocStrong
-call s:WithConceal("definition", 'syn match pandocDefinitionBlockMark /^\s*[:~]/ contained', 'conceal cchar='.s:cchars["definition"])
-" }}}
 " List Items: {{{2
 "
 " Unordered lists
@@ -427,6 +422,12 @@ syn match pandocListItemBulletId /\(\d\+\|\l\|\#\|@.\{-}\|x\=l\=\(i\{,3}[vx]\=\)
 
 syn match pandocListItemContinuation /^\s\+\(\([-+*]\|(\?.\+[).]\)\@<![[:alpha:]ñäëïöüáéíóúàèìòùłßÄËÏÖÜÁÉÍÓÚÀÈÌÒÙŁß_"[]\)\@=.*$/ nextgroup=pandocLaTeXMathBlock,pandocLaTeXInlineMath,pandocDelimitedCodeBlock,pandocListItemContinuation,pandocListItem contains=@Spell,pandocEmphasis,pandocStrong,pandocNoFormatted,pandocStrikeout,pandocSubscript,pandocSuperscript,pandocStrongEmphasis,pandocStrongEmphasis,pandocPCite,pandocICite,pandocCiteKey,pandocReferenceLabel,pandocReferenceURL,pandocLaTeXMathBlock,pandocLaTeXInlineMath,pandocAutomaticLink contained skipempty display 
 " }}}
+" Definitions: {{{2
+"
+syn region pndocDefinitionBlock start=/^\%(\_^\s*\([`~]\)\1\{2,}\)\@!.*\n\(^\s*\n\)\=\s\{0,2}[:~]\(\~\{2,}\~*\)\@!/ skip=/\n\n\zs\s/ end=/\n\n/ contains=pandocDefinitionBlockMark,pandocDefinitionBlockTerm,pandocCodeBlockInsideIndent,pandocEmphasis,pandocStrong,pandocStrongEmphasis,pandocNoFormatted,pandocStrikeout,pandocSubscript,pandocSuperscript,pandocFootnoteID,pandocReferenceURL,pandocReferenceLabel,pandocLaTeXMathBlock,pandocLaTeXInlineMath,pandocAutomaticLink,pandocEmDash,pandocEnDash
+syn match pandocDefinitionBlockTerm /^.*\n\(^\s*\n\)\=\(\s*[:~]\)\@=/ contained contains=pandocNoFormatted,pandocEmphasis,pandocStrong nextgroup=pandocDefinitionBlockMark
+call s:WithConceal("definition", 'syn match pandocDefinitionBlockMark /^\s*[:~]/ contained', 'conceal cchar='.s:cchars["definition"])
+" }}}
 " Special: {{{2
 
 " New_lines: {{{3
@@ -480,6 +481,7 @@ hi link pandocHTMLComment Comment
 hi link pandocHTMLCommentStart Delimiter
 hi link pandocHTMLCommentEnd Delimiter
 hi link pandocBlockQuote Comment
+hi link pandocBlockQuoteMark Comment
 
 " if the user sets g:pandoc#syntax#codeblocks#ignore to contain
 " a codeblock type, don't highlight it so that it remains Normal