remember PsiAnchor creation mod count for invalidity diagnostisc
[github] Stop progress to show not-trusted cert warning

Problem:
If a Mac Message dialog is shown when under modal progress, it becomes
non-clickable.

To avoid it:
move the dialog asking about non-trusted SSL certificate "upwards":
  * catch the SSL exception right in the accessWithModalProgress(),
  * finish the modal task,
  * ask if user trusts the host,
  * retry the task (and start another modal progress).
[vcs] remove unused methods, cleanup
Support connections