Implement manual trigger of bond breakage

[1234somesh]

Fixes #4665

[jngrad]

The feature is missing a test. The feature throws an exception.

[RudolfWeeber]

The probelm was that

• bond breakage handlers return true if they did something
• but kernels to cell_strucutre::bonded_loop (and short_range_loop) return true if a bond is broken

I.e. the return value of the former has to be discarded in the latter.