Remove _coordinatorId from DmtcpMessage.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2285 ba6dc0ae-232f-0410-883f-9ebac64fc565
Replace time_t with uint64_t for coord tstamp.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2286 ba6dc0ae-232f-0410-883f-9ebac64fc565
Replace long with uint64_t for hostid.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2287 ba6dc0ae-232f-0410-883f-9ebac64fc565
Replace int with uint32_t for ckpt generation.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2288 ba6dc0ae-232f-0410-883f-9ebac64fc565