Remove check for old versions of Vim.

There was some check regarding specific features Vim have, like
spell check which was introduced with Vim 7.0, and even on old
repositories, the oldest version of Vim I could find is 7.4. Let's get
rid of unnecessary legacy.

colors/wombat256grf.vim

@@ -10,11 +10,9 @@
 
 set background=dark
 
-if version > 580
+hi clear
-    hi clear
+if exists("syntax_on")
-    if exists("syntax_on")
+    syntax reset
-        syntax reset
-    endif
 endif
 
 let g:colors_name = "wombat256grf"
@@ -161,13 +159,9 @@ call s:highlight("Normal",       "dddddd",   "242424",   "none")
 call s:highlight("NonText",      "4c4c36",   "",         "none")
 call s:highlight("Cursor",       "222222",   "ecee90",   "none")
 
-if version > 700
+call s:highlight("CursorLine",   "", "32322e",   "none")
-    call s:highlight("CursorLine",   "", "32322e",   "none")
+hi link CursorColumn CursorLine
-    hi link CursorColumn CursorLine
+call s:highlight("ColorColumn", "", "2d2d2d", "")
-    if version > 703
-        call s:highlight("ColorColumn", "", "2d2d2d", "")
-    endif
-endif
 
 call s:highlight("Search",       "444444",   "ffab4b",   "")
 call s:highlight("MatchParen",   "ecee90",   "857b6f",   "bold")
@@ -245,13 +239,11 @@ call s:highlight("DiffDelete", "343434", "101010", "bold")
 call s:highlight("DiffChange", "", "53402d", "bold")
 
 " Spellchek
-if  version > 700
+" Spell, make it underline, and less bright colors. only for terminal
-    " spell, make it underline, and less bright colors. only for terminal
+call s:undercurl("SpellBad", "881000")
-    call s:undercurl("SpellBad", "881000")
+call s:undercurl("SpellCap", "003288")
-    call s:undercurl("SpellCap", "003288")
+call s:undercurl("SpellRare", "73009F")
-    call s:undercurl("SpellRare", "73009F")
+call s:undercurl("SpellLocal", "A0CC00")
-    call s:undercurl("SpellLocal", "A0CC00")
-endif
 
 " Plugins:
 " ShowMarks