add if exists to drop table fs2_comments

Signed-off-by: Sweil <mail@sweil.de>
add overwrite option to context
changed is_writable and is_readable to use fopen

Signed-off-by: Sweil <mail@sweil.de>
documentation of file operation syntax

Signed-off-by: Sweil <mail@sweil.de>
started work on automatic template converter

Signed-off-by: Sweil <mail@sweil.de>
fixed new file path handling

Signed-off-by: Sweil <mail@sweil.de>
fixed some File and FileX bugs
fixed wrong file jobs

Signed-off-by: Sweil <mail@sweil.de>
made db connection more robust

Signed-off-by: Sweil <mail@sweil.de>
changed wrapper functionallity a lot:
 - uses Path class now with types 'current' and 'target'
 - some File-funtions decide to use paths from write wrapper group (if available)

Signed-off-by: Sweil <mail@sweil.de>
finished url wrapper, but it is still not a good option.

Signed-off-by: Sweil <mail@sweil.de>
finished template operations regex
start work on tempaltes for template operations

Signed-off-by: Sweil <mail@sweil.de>
added template instructions info handling
todo: tune lang-texts

Signed-off-by: Sweil <mail@sweil.de>