Please review fixes to be pushed into release 7.0

Hi,

Here are several more change sets I'm going to integrate into release70.

Bug description:
#196501 "Error synchronizing project to <login>@<host> null" occurs 
periodically
http://netbeans.org/bugzilla/show_bug.cgi?id=196501

Impact:
An error message concerning synchronization to the remote project 
appears frequently, sometimes it's a false alarm.
It appears even if user builds another (local) project, in the case 
imported remote project is open.

Verification/Review:
QA (Alexander Pepin) verified fix in trunk.
Code is reviewed by Alexander Simon (bdfdb89cdc85, 0c6dc46145ed, 
d290f4bd3c4d)
and Vladimir Viskresensky (8392668078da, a17ea1527b94)

Changesets:
http://hg.netbeans.org/cnd-main/rev/ bdfdb89cdc85
http://hg.netbeans.org/cnd-main/rev/a17ea1527b94
http://hg.netbeans.org/cnd-main/rev/8392668078da
http://hg.netbeans.org/cnd-main/rev/0c6dc46145ed
http://hg.netbeans.org/cnd-main/rev/d290f4bd3c4d

Regards,
Vladimir