- bugfix in xpath expressions to handle correct delete/purge events

- fixed XPATHs for purged event handling

r2022.1

Closes #5

See merge request !1

- improved transactions around calls of write_addsql() for each IE

- fixed "enable-sqldump" option

- fixed multiple connect/disconnect calls to db in inner loop

- refactoring, extracted searching_relevant_ie_files()

- added support for multiple AIP versions
- fixed 'ie_id' in table 'aip' (== IEPID)
- removed deprecated code

- disabled check_if_dbconform() calls, because if something is not UTF8 ready, the SQLite will report it directly
- improved get_files_ref()

- Entfernung Wertung

- Erklärung, warum SQL Script groß wird hinzugefügt
- Erweiterung Konsequenzen

- simplified and improved get_dc_records()

- fixed filepaths

- use compiled xpaths
- use precompiled xpathcontext
- use nodeValue() instead triggering findvalue()
- handle purged IEs
- hande all variants of localreps (LOCAL and LZA and LZA_INTERN)