Added CommandBuilder, basic breakpoints

Breakpoints now function. Remove breakpoint still nonfunctional, use rab. Added "currentCommand" member to Cli. Cli needs major changes to be fully integrated with breakpoint funcitonality.
bugfixes
WIP read and write solutions as XML files

This never got done.
Merge branch 'read_write_solutions'

Conflicts:
	src/main/aldb/Cli.java