doc: version bump Doxyfile

- bump version to 0.9.99
- exclude leveldb and json
- include call and caller graphs in the documentation.
Merge pull request #3926

c337e2e Update gitian README.md (Wladimir J. van der Laan)
qt: Use locale-specific number formatting

- Change bitcoinamountfield to use locale-specific number format
- Change bitcoinunits to show and parse locale-specific numbers
- If a language/territory is selected in options, this is set as default
  locale (overrides system locale).

Fixes #3887
qt: Add tests for bitcoin units parsing/formatting

Tests various locales, as well as variants with and without
decimals group separators.