merge barcode reader file input

[louking]

• [x] database: add scannedbib to result table, related to scannedbib table
• [x] database: add attribute to race, had_scannedbib (boolean)
• [x] Use button copies scannedbib.bibno to bibno
• [x] Ins button inserts none at current place and pushes all later scannedbib.bibno one place higher
  • [x] Ins should also add had_scannedbib=True to next result after last had_scannedbib
• [x] Del button removes scannedbib.bibno at current place and pushes all later scannedbib.bibno one place lower
  • [x] Del of scanned bib should also set had_scannedbib=False for the last result with had_scannedbib
• [x] barcode reader async process - send scanned bibs to server via REST api
  • NOTE: scanner seems to send two CR at end of bib number 31 36 38 38 0d 0d 1688..
• [x] use tm_reader to get options for port fields
• scanner not connected
  • [x] hide scanned_bibno and bibalert columns
  • [x] don't use alert color for bibalert
• server receives scanned bibno
  • [x] adds to scannedbib table
  • [x] update next result
• check Ins / Del edge cases
  • [x] scanned bib received but not result (all results have scanned bib)
  • [x] insert scanned bib when all results have scanned bib
  • [x] delete scanned bib when all results have scanned bib
  • [x] delete result when it has scanned bib (not permitted)
  • [x] new result added when next result has scanned bib (show scanned bib buttons)
  • [x] new result added when next result doesn't have scanned bib (no scanned bib buttons)
• server receives result
  • [x] if last result had received a scanned bib, add the next scanned bib to this result and update next scanned bib if there is one
• [x] test filelock