variable "hi" is never used (http://apertium.projectjj.com/apt/scan-build/lttoolbox/report-eb5709.html, http://apertium.projectjj.com/apt/scan-build/lttoolbox/report-45c259.html)

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@55719 72bbbca6-d526-0410-a7d9-f06f51895060
setting prevstate to -1 is not needed here, reset at next iteration of loop (http://apertium.projectjj.com/apt/scan-build/lttoolbox/report-ff4b71.html#EndPath)

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@55720 72bbbca6-d526-0410-a7d9-f06f51895060
this variable initialisation ought to have been commented too (avoiding the obvious "what idiot littered the code with these crappy comments" question) - http://apertium.projectjj.com/apt/scan-build/lttoolbox/report-f9bb64.html#EndPath

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@55721 72bbbca6-d526-0410-a7d9-f06f51895060
document what "dirty" means

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/lttoolbox@55722 72bbbca6-d526-0410-a7d9-f06f51895060