make it easy to run e under valgrind and debug crashes.

this should help us in near future:

  * -valgrind[=MODE], to run under valgrind and toggle interesting
     options as we often request users to give us valgrind logs but
     they're often running valgrind on wrong binaries and with wrong
     parameters. See enlightenment_start -help for more, but in sort:
     -valgrind=all should give us enough information.

  * -valgrind-log-file=path, so the log will not mix with lots of
     output we do.

  * debug: on crashes, always list traceback (execinfo/glibc
    functions) and check if gdb exists, if so ask it to print out
    traceback of all threads to stdout. gdb will be detached as soon
    as messages were printed and everything should work without gdb as
    well.



SVN revision: 41309

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