[w2llatexform][w2lonpdf] Changes to pages appearance. Added CSS
[w2llatexform][w2lonpdf] Style changes. CSS id and class added.

New CSS: '#w2lFmFormer' is the id of the form in the 'w2llatexform' page and
'.w2lLogOutput' is the class of the textareas in the 'onpdf' page.
There is no defined style for those elements, their CSS code must be written
in a skin of the wiki.

Added two messages:
- 'wiki2latex_version' which shows the extension name with its version.
- 'wiki2latex_version_tag' shows the extension name between the passed
parameters. The first one is meant to be the opening tag and the other the
closing tag. This allows to write (e.g.) "&lt;a href="site.com"&gt; Wiki2Latex
&lt;/a&gt; (W2L_VERSION)".
[parser] Added support for align, gather, multiline and array environs. Do more debug.
Added some documentation for the problems of the latest commits.

The following strings:
   [linksToOutsite], [bugSignaling], [documentation]
are meant to be a marker for the points of code where a problem needs to be fixed.

Follow also the corresponding issues on github.com
[bugReporting]Changed link for bug reporting.

See issue #15 on Github.com :
https://github.com/WikiFM/Wiki2Latex/issues/15'
Merge pull request #11 from alvarin32/master

[w2llatexform][w2lonpdf] Style changes. CSS id and class added. …