Fix signed-ness bugs in read-memory request code. Resolves #60.
Merge pull request #63 from cgjones/fix-getmem

Fix signed-ness bugs in read-memory request code. Resolves #60.
Advance the trace to exec() before processing debugger commands.
Merge pull request #64 from cgjones/fix-exec

Advance the trace to exec() before processing debugger commands.