GitLab

Split at '.' or ':', ref https://www.riscosopen.org/forum/forums/4/topics/15150
Actively report if the dir given exists but application does not, eg.
  *AddApp !NotPresent
because if no dir is given @ is used, @ always exists, compare with
  *AddApp NotPresent.!Anything
which errors because the dir doesn't exist (and by extension !Anything also).
Also, return a descriptive error if malloc fails rather than just be silent.

Version 1.52. Tagged as 'BootCmds-1_52'