Merge pull request #348 from dubslow/master

tweak #340 dht connecting, remove dropped avatars from cache
Filetransfer: speed calculation fix
Merge pull request #353 from apprb/speed

Fix #351 (File transfers exceed physical limitations)
Create desktop file for GNU-Linux
add utox icons for packaging
Fix performance regression, revert part of 87c9bbf1e6f7565bcf8aba7cb1f61dea004912e9
added table of content
Merge pull request #354 from retuxx/master

added table of contents
Update package dependecies, close #355
Update win32 build config
first thing's first, gotta placate the ocd
bootstrap tweaks