bugfix: double-free in omelasticsearch

closes: http://bugzilla.adiscon.com/show_bug.cgi?id=461
Thanks to Marius Ionescu for providing a detailled bug report
Merge branch 'v7-stable'
omrelp: add "windowSize" parameter to set custom RELP window size
doc: rollback html edit of imfile doc

The html editor did a total rewrite, which causes merges from
older versions to fail miserably.
rollback html editor rewrite of imfile
Merge branch 'v7-stable'
doc/imfile: re-do spelling corrections
Merge branch 'v7-stable'
doc: add new omrelp parameter "windowSize"
prepare for 7.4.2 release
Added header in typedefs.h needed for building on ehel 5
Merge branch 'v7-stable-hidden' into v7-stable
doc: mention imported build patch for CENTOS5
Merge branch 'v7-stable'

Conflicts:
	ChangeLog
	configure.ac
	doc/manual.html
prepare for 7.5.2
doc: mention omelasticsearch bugfix in 7.5.2 changelog
doc: mention that omelasticsearch bug requires custom config to be triggered

This means the majority of users is not affected at all.
Merge branch 'v7-stable'
doc: mention that omelasticsearch bug requires custom config to be triggered
bugfix: very small memory leak in imrelp

more or less cosmetic, a single memory block was not freed, but this
only happens immediately before termination (when the OS automatically
frees all memory). Still an annoyance e.g. in valgrind.