Features
* Completed 1: Users can now manage tombs within a catacomb, allowing multiple tombs for different purposes
* New entry point `catacomb [COMMAND] [ARGS]`
* New command `catacomb create [ALIAS]`
* New command `catacomb open [ALIAS]`
* New command `catacomb bury [ALIAS]`
* New command `catacomb list`
* Completed 4: Users can now see which tomb they are currently in, and the number of commands in it
* New command `tomb status`
Improvements
* Restricted the number of arguments allowed for the optional [COMMAND] field in `tomb add ALIAS [COMMAND]` to just one
* For example `tomb add cmd ls -lah` will no longer work, the command will now need to be surrounded with quotations like so: `tomb add cmd "ls -lah"`
* Better descriptions of entry points and various commands
Fixes
* Fixed 3: Previously a stack-trace was being shown when an invalid command was entered, an appropriate message has now replaced that