* Option to search registers.
* Memory limits, warn on too many matches?
* Allow user to build a set of addresses and values that can be re-inserted on command. (macros)
* Use readline.
* allow user to save addresses with labels
* differentiate between signed and unsigned integers, > and < probably dont work for these right now.
* better command line parsing.
* better online help, eg "help delete"
* memory leak with dregion (free the pathname)
* implement a completion function for readline.
