- Rather than redisplaying just added/deleted breakpoints, entire source is...

- Rather than redisplaying just added/deleted breakpoints, entire source is redrawn. Operation is rare, so it's ok, and the code is neater.
- Since functions `reload_breakpoints_and_redisplay` and `reload_breakpoints` didn't use their arguments, arguments are now removed. Where they were called, now lambda is used.