Selected entries can be locked by pressing "l".

In addition to locking by right-clicking, a selected entry may now be
locked by pressing "l".
Segfault when locking unselected record.
Add option to change case.

By pressing "u" or "U", the selected entry's case will be completely
changed, respectively, to lower or upper casee.
Error handling for failed operations.
Add manual trim/strip operation.

Pressing "t" will left and right trim the currently-selected entry.