Set error_id in RvbdHTTPException
- Instead of guessing the time resolution of the view timestamp set it explicitly when the view is applied so that when the output is requested the time resolution is known. This allows to apply a view on a file captures before 2001. At the moment the time resolution can't be changed to a value different from nanoseconds because of a bug on the server. We need to support on "timespan-hp" the same operations we currently do on "timestamp-hp" in XJObject.
- Fixed the computation AVG on relative time fields.

Review: https://review.lab.nbttech.com/r/88599
ReviewedBy: cwhite
- The FS get_all() actually get recursively all the files present in the user folder
- Added the method _get_separator() in FS so that Flyscrip can be used against a server running on windows as well

Review: https://review.lab.nbttech.com/r/88601
ReviewedBy: cwhite
- Fixed a call to serverinfo: additional parameter specified. Doing syntactic checks only at runtime for a programing language seems stupid to me.

ReviewedBy: mcaponetti
Moved file separator into shark. Fixed tests.
Fix support for resolutions about 15min