Fallback to DB storage of event IDs on error
Add `reset` method to EventLogLoader

This can then be used to hook into the end of a successful event log
batch load.
Fix visibility on internal implementation details
merge dev_5_0 -D org -I include -E exclude: PR 2086 (Record PersistentEventLogLoader event ID to file (see #11948))
merge dev_5_0 -D org -I include -E exclude: PR 2108 (release-src includes bioformats version metadata)
merge dev_5_0 -D org -I include -E exclude: PR 2115 (Update dev_5_0 submodules)
merge dev_5_0 -D org -I include -E exclude

Repository: openmicroscopy/openmicroscopy
Excluded PRs:
  # PR 2116 dominikl 'Inplace import icon dev 5 0, 11970' (user: dominikl)
  # PR 2105 will-moore 'Sort images timestamp 11986' (label: exclude)
  # PR 2104 will-moore 'Owner remove last user 11984' (label: exclude)
Already up-to-date.

Merged PRs:
  # PR 2086 jballanc 'Record PersistentEventLogLoader event ID to file (see #11948)'
  # PR 2108 rleigh-dundee 'release-src includes bioformats version metadata'
  # PR 2115 snoopycrimecop 'Update dev_5_0 submodules'

Repository: openmicroscopy/bioformats
Excluded PRs:
  # PR 919 melissalinkert 'Update POM version numbers to 5.0.0-SNAPSHOT post 5.0.0-rc3' (label: exclude)
  # PR 915 imunro 'Fix for single channel  meas_mode 13 data.' (label: exclude)
Already up-to-date.

Merged PRs:
  # PR 920 sbesson 'Fix hard-coded link in documentation'
  # PR 921 hflynn 'Final BF doc updates for 5 release'
  # PR 922 sbesson 'Remove bioformats_package.jar from the bftools.files'
  # PR 924 melissalinkert 'I/O fixes for ticket #12001'

Repository: ome/scripts
Already up-to-date.

Repository: openmicroscopy/ome-documentation
Already up-to-date.

Merged PRs:
  # PR 666 hflynn 'what's new for 5.0 updates'
  # PR 667 zeb 'Add details for omero_home usage'

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