Merge pull request #27 from pavel-pimenov/master

string xxx(""); -> string xxx;
calloc -> malloc
Add zlib_min_len variable
Check for pipe in compressed message
Fix main chat message parser
Try to fix messages containing NULL character in the end
Add detailed NULL characters report
Fix To and MCTo command parsers
Fix CTM2HUB message from buggy clients
Fix plugin PM callback when message is sent to bot
Fix operator chat command reply
Code cleanup
Fix main chat delay option
Add optional delay parameter for restart and quit commands, standard time units are used