setting it to E_PARSE causes some errors to be missed - e.g.
`$a[$b][] $c;`
will not cause an error to get reported as this is classed as a compile
error, not a parse error.
This should fix#206.
* remove the public SyntasticHighlightErrors() function
* shift the above code into s:HighlightErrors(). This is called
automatically if g:syntastic_enable_highlighting is set
* to get the highlight regex we just look for a function called
Syntastic_<filetype>_GetHighlightRegex
* to force this function to be called, each error item must have the
'force_highlight_callback' key set
This code has one important functional change: now errors are *always*
highlighted if possible whereas previously they were only highlighted if
a call to SyntasticHighlightErrors was made.
running phpcs on a file which contains a parse error generates a huge
number of warnings from the phpcs library. This can freeze vim for
minutes at a time while it attempts to parse these
notices/warnings/errors.
Therefore - don't run phpcs on files which have parse errors.
PHPCS has a wide variety of commandline flags, including
support for various syntaxes. These must be configurable,
otherwise phpcs generates a high number of spurious errors for
code written to any standard other than the PEAR standard.
