[Crash-utility] [PATCH] Expanded search capability for crash

This patch adds options to crash's search command that allow searches for character strings (-c), unsigned hexadecimal integer values (-w), and unsigned hexadecimal short values (-h). The integer and short values are searched on integer and short alignments respectively. Strings are searched across contiguous page boundaries, which can cause possibly confusing behavior since contiguity is affected by the type of search. For example, a page-crossing string found in a user virtual address search might not be found in a kernel virtual address search if the kernel pages mapped to the user address space are not contiguous. The patch is for crash-5.1.2 and has been tested on an x86_64 system. Some last minute caveats on with search due to the parser (worth putting in help?): All numbers are interpreted as hex numbers, regardless of starting character. Double quotes are magic to crash's parser, so strings of almost anything can be enclosed in "", for example: "can't". Single quotes mean nothing, so searching for 'dog' is the same as searching for "'dog'". Bob Montgomery