Bug 702584 - \cite rejects valid BibTeX keys

Added possibility for . (dot) and + (bit analogous to file names. A . (dot) cannot be the last character)

src/commentscan.l

@@ -914,7 +914,9 @@ FILEECHAR [a-z_A-Z0-9\x80-\xFF\-\+@&#]
 FILE      ({FILESCHAR}*{FILEECHAR}+("."{FILESCHAR}*{FILEECHAR}+)*)|("\""[^\n\"]*"\"")
 ID        "$"?[a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF]*
 LABELID   [a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF\-]*
-CITEID    [a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF\-:/]*
+CITESCHAR [a-z_A-Z\x80-\xFF]
+CITEECHAR [a-z_A-Z0-9\x80-\xFF\-\+:\/]*
+CITEID    {CITESCHAR}*{CITEECHAR}+("."{CITESCHAR}*{CITEECHAR}+)*
 SCOPEID   {ID}({ID}*{BN}*"::"{BN}*)*({ID}?)
 SCOPENAME "$"?(({ID}?{BN}*("::"|"."){BN}*)*)((~{BN}*)?{ID})
 TMPLSPEC  "<"{BN}*[^>]+{BN}*">"

src/doctokenizer.l

@@ -333,7 +333,9 @@ BLANK     [ \t\r]
 ID        "$"?[a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF]*
 LABELID   [a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF\-]*
 PHPTYPE   [\\:a-z_A-Z0-9\x80-\xFF\-]+
-CITEID    [a-z_A-Z\x80-\xFF][a-z_A-Z0-9\x80-\xFF\-:/]*
+CITESCHAR [a-z_A-Z\x80-\xFF]
+CITEECHAR [a-z_A-Z0-9\x80-\xFF\-\+:\/]*
+CITEID    {CITESCHAR}*{CITEECHAR}+("."{CITESCHAR}*{CITEECHAR}+)*
 MAILADR   ("mailto:")?[a-z_A-Z0-9.+-]+"@"[a-z_A-Z0-9-]+("."[a-z_A-Z0-9\-]+)+[a-z_A-Z0-9\-]+
 OPTSTARS  ("//"{BLANK}*)?"*"*{BLANK}*
 LISTITEM  {BLANK}*[-]("#")?{WS}