Papr

- bugfix: exception terminated papr when notes or summary did not exist after editing

- intern: migration to a more open and accessible storage structure for notes, summaries and metadata
- feature: use shift + keyup/keydown to jump 5 entries up/down
- feature: page down/up
- feature: specify more than one url for fetching
- feature: specify tags when fetching a paper
- feature: export to HTML from ui (markdown is converted to HTML)
- feature: option to filter the export
- feature: command line argument "html" to export the database into an HTML file
- feature: renamed extension from temporary editing file from .tmp to .tmp.md
- feature: split long lines at spaces when shown with less so that words are not split
- bugfix: less is confused when showing lines with escape sequences having as many characters as the terminal size

- feature: if a new version of papr is available show this at the top
- feature: change title of a paper
- feature: hide papers
- feature: show changelog on first start after upgrading papr to a new version
- feature: context menu when key 'space' is pressed
- feature: create a summary and list papers with a summary

- feature: call "papr config viewer <value>" to set the default viewer
- feature: highlight matches in search results

- feature: shortcut 'l' to show statistics about tags
- feature: redraw when terminal is resized
- feature: new default search is a substring search; regex search via 'r'
- feature: filter by tag via 'f'
- intern: refactored ui

- feature: when downloading a paper also extract the abstract (only for arxiv and openreview)
- feature: shortcut 'y' to show all information about a paper
- feature: shortcut 'a' to show the abstract of a paper (only when abstract was extracted during download)
- intern: store URL to paper in repository