Versioned to 1.7.4-rc8

Fixed "heads/" prepend problem for plugin upload deskflow#4695

Fixed tab indentation in ChangeLog

ChangeLog for v1.7.1-stable

ChangeLog for 1.7.0

Fixed client detected dialog not shown when Synergy is minimized desk…

…flow#4307

Suppressed empty server warning on startup deskflow#4240

Tagged 1.6.1

tagging 1.6.0

tagging 1.5.1 [no-issue][no-build]