DTC install fails on Win 2003 R2 x64 SP2

with message 'MSDTC could not be found in the registry. Cannot
continue.'
when called from 32bit process
Merge pull request #1747 from chrisbednarski/MSDTCSetup

DTC install fails on Win 2003 R2 x64 SP2 from x86 process
Added worker sessions concept
Still need to handle backwards compatibility
Rethrows reset stacktrace, fixes #1748
Merge branch 'develop' into Issue_1732