Citation-graph

- Bug fixes
- Improved speed by skipping waiting before cached papers
- Improving cache lookup to prevent collecting papers missing until limit is reached
- Allow to exclude papers
- Add list mode
- Add customizable log / cache file
- Improve graph tooltip information
- Overwork cache / log file to contain request limits

- More granular caching
- Allow reuse of cached entries with modified arguments
- Restructure code base
- Skip unnecessary waiting time
- Skip papers where citation count is zero
- Fix maximum number of citations
- New GUI

- Better colors
- Bugfixes

Initial version