Fix Cactus Startup Problems

[Steven R. Brandt]

The recent Mag TOS work in CarpetX revealed that File.c had a threading problem. It also revealed that the scheduler can sometimes retrace a RDWR declaration. Both of these startup issues need addressing.

PR: https://bitbucket.org/cactuscode/cactus/pull-requests/160

Please Review.

[Steven R. Brandt]

As a result of Roland’s comments, I’m replacing this with two PRs.

https://bitbucket.org/cactuscode/cactus/pull-requests/161 to address the RDWR issue. The next PR will be added here shortly.

[Steven R. Brandt]

https://bitbucket.org/cactuscode/cactus/pull-requests/162 is the PR for the file access safety

[Roland Haas]

Please apply 161 (162 is not yet approved).

[Roland Haas]

Issue #2781 was marked as a duplicate of this issue.

[Roland Haas]

Please apply (162).

[Roland Haas]

Applied as git hash dcc71a70 "Cactus: remove non thread safe string manipulation code" of cactus