Consistency of usage of the word LaTeX in the documentation

The word LaTeX was used as just the word and on other places as \f$\mbox{\LaTeX}\f$
This has been made more consistent by means of the definition of the Alia \LaTeX (similar for \TeX)
Some names of executables etc. were not set in a 'code' font.
Added stricter URL filtering to prevent DOM Based XSS when the tree view is enabled
Bug 728530 - Crash on \addindex \term
Inconsistency in usage of simplesecr versus simplesectsep corrected
Undo previous commit
Inconsistency in usage of simplesecr versus simplesectsep corrected
Merge pull request #154 from albert-github/feature/bug_docbook_simplesectsep

Inconsistency in usage of simplesecr versus simplesectsep corrected
Bug 692985 - Notes in xml output are not correctly separated
Merge branch 'master' of github.com:doxygen/doxygen
Merge pull request #152 from gilelad/master

Fix segfault on invalid bounding FIG when patching dot
Merge pull request #151 from albert-github/feature/bug_docu_latex2

Consistency of usage of the word LaTeX in the documentation
Merge branch 'master' of github.com:doxygen/doxygen
Bug 712251 - Documentation for enumeration not generated
Made INSTALL file version and date independent
Added last and first attributes to index tree node
Bug 172072 - $title doesn't work in LateX header

In case $title is used in the latex header or footer it is now replaced with the empty string (it was left inside, resulting in non translatable LaTeX code), the documentation has been updated too.

See also:
Bug 668004 - LATEX_HEADER should share common information with HTML_HEADER
Bug 401327 - LATEX_HEADER: $title does not get expanded
Updated changelog for release 1.8.7
Bump version number
Corrected copyright year
Merge pull request #158 from albert-github/feature/bug_copyright

Corrected copyright year