Compression::string_write / string_read

Needed for apertium's pcre_version storing

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@57369 72bbbca6-d526-0410-a7d9-f06f51895060
lt-trim: fix bug with bidix epsilons

I had only fixed for the monodix case earlier :(

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@57407 72bbbca6-d526-0410-a7d9-f06f51895060
Merge branch 'master' of https://github.com/jimregan/lttoolbox