These 2 patches I've just bumped up in the pending branch order. They are needed to fix recent changes to python build system.
The SOURCE_MOUNTS_DEFAULTS is to compliment the TARGET_MOUNTS_DEFAULTS and simplifies it's use through the code. It also is one step closer to having them configurable. The shm patch is a merge of 3 patches into this final one. The changes have all been tested. These jsut need testing due to the rebase. I hope to merge these patches this weekend along with teh previous 6 that fix other commits already applied. They have had lots of scrutiny and review already.
