Terminal output of zimport

[icornelius]

zimport reports progress ("Processing FILENAME...") and errors (unexpected keys, invalid YAML). This behavior is appropriate for small collections of zetteln. When importing large collections (hundreds of files), the progress report drowns out the error messages.

A possible solution is to count the files in the directory tree targeted for import, then reduce the verbosity of zimport above a certain threshold (100 files, perhaps). Some sort of progress reporting remains desirable, as importing a collection of 1000+ files can take 15 seconds, depending on system. Perhaps we could set a counter and emit progress at milestones (every 100th file, e.g.). Or write errors to a log file.

[icornelius]

859a60f modifies zimport to print a count of errors. Users will need to scroll through the output for details.