Feature: Markdown link: VimwikiTOC supports multiple heading with same name (Issue: #968, 666, #664)

Anchor can be suffixed with -1 -2 according to the heading number (in
file) user want to reach.
Implemented with a dictionary for caching anchor names (without sufix)

test/command_toc.vader

@@ -1,5 +1,6 @@
 # VimwikiTOC {{{1
 #
+# TODO implement: If link in the heading (see README.md)
 # TODO (10min) test if g:vimwiki_to_header well readen
 # TODO (10min) test vimviki_toc_link_format
 # TODO (1h) test if really wiki dependant (for 2 diffrent wikis)
@@ -10,21 +11,52 @@
 # -- 3. changes any space to a hyphen => OK: from previous big
 # -- 4. If that is not unique, add "-1", "-2", "-3",... to make it unique => TODO not implemented
 # 
+#
+# TODO if link in heading
+#Given vimwiki (Two same heading {{{1):
+#  # Pre [link](anything no parenthesis) Post
+#
+#Execute (Set syntax markdown && Set sw=8):
+#  call SetSyntax('markdown')
+#  set sw=8
+#  VimwikiTOC
+#
+#Expect (Suffix -1 and -2):
+#
+#
+#
+#
 # Start {{{1
 
-" TODO
-"Given vimwiki (Two same heading {{{1):
-"  # One
-"  ## two
-"  ## Two
-"
-"Execute (Set syntax markdown && Set sw=8):
-"  call SetSyntax('markdown')
-"  set sw=8
-"  VimwikiTOC
-"
-"Expect (Suffix -1 and -2):
-"
+
+
+Given vimwiki (Two same heading (#968) {{{1):
+  # One
+  toto
+  # ONE
+  like
+  ## oNe
+  you
+
+Execute (Set syntax markdown && Set sw=8):
+  call SetSyntax('markdown')
+  set sw=8
+  VimwikiTOC
+
+Expect (Suffix -2 and -3):
+  # Contents
+
+  - [One](#one)
+  - [ONE](#one-2)
+          - [oNe](#one-3)
+
+  # One
+  toto
+  # ONE
+  like
+  ## oNe
+  you
+
 
 Given vimwiki (Heading with many bad caracters {{{1):
   # One !@#@#(!%#&$^(!@