Fixes #3959: Move AC_CONFIG_FILES fix to v1.7

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r29829 [[BR]]
Fix ordering problem in AC_CONFIG_FILE actions.

The chmod action statements need to be put in individual
AC_CONFIG_FILE statements that generate the target file in question.
With the original code, the 2 chmod statements were executed for
''each'' file in the AC_CONFIG_FILES block (resulting in both error
messages before the files were created, and needless chmods after the
files were created).
Fixes #3960: Move r29831 to v1.7 branch (add support for mpiexec_timeout)

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r29831 [[BR]]
Per request from Dave Goodell, add support for MPIEXEC_TIMEOUT - if set in the environment, terminate the job after the specified number of seconds has passed. Equivalent to MPICH functionality.

cmr=v1.7.4:reviewer=dgoodell:subject=add support for MPIEXEC_TIMEOUT


r29833 [[BR]]
Really is better if we output a message indicating that the job was aborted due to hitting the execution time limit

Refs #3960