Initial commit (before using JSON)
Now using JSON. The program is working well.
Now git ignores 'humble-bugs' file (default database name)
Many changes, the commit isn't backward compatible

* Started using a new coding style which doesn't hate { } and ( ).
  Sometimes they are much easier to read than the alternative because:
  - Some editors (gedit, VIM etc.) support highlighting of the pair of a
    (){}.
  - do/end keywords are visually seen as having the same role like 'if',
    'else', 'def' while they are actually block delimiters.
* Commented a part of the unused code and removed some duplicate code.
* A remarkable change is that the ?, open?, fixed? commands output using
  'less' Linux command.
* Changed 'db' to 'database' in the database identifier string.
* Greatly improved help text. Also, less bold, more green! (in terminal
  output)
* The program can be used as a library now, but it's not designed for
  that.
* Issue IDs now start at 1.
* I put current date and time with fractions of seconds in temporary
  files' names.
* Many other small changes and improvements.
Add a comment with a conclusion to String.bold
Added a readme file and the Apache 2 license

This commit prepares the local repo to be pushed to GitHub.
Also added default GitHub .gitignore entries to my local .gitignore.