Convert utf-16 files to utf-8

The testsuite engine expects all tests to be utf-8 compatible, and
chokes on the byte order mark.
DumpRenderTree: various fixes

* Catch SIGILL as well as SIGABRT and SIGSEGV
* Fix a triple-free in the pixel dump code
* Add support for user scripts
* Some misc fixes
Version 1.2.1.
Delete the crash report once it is read.

The contents will be copied to the crash-log file for the test that
triggered the crash.