Fix issue MR-332 - Can't select different tab with one click after disconnecting existing tab

(cherry picked from commit 73f71050a0aad4075572e5efb923a79c1525e301)

Conflicts:
	CHANGELOG.TXT
Revert "Fixed issue MR-229 - Integrated PuTTY doesn't work in Windows 8 RP"

This reverts commit c29c5015d510e097e2b39095e20d2119857fd000.
Fix issue MR-338 - PuTTYNG crashing on fresh install of mRemoteNG
Update CHANGELOG.TXT for release of 1.70 Release Candidate 2.