raPPPid v2.0

(+) raw Android sensor data from Google GnssLogger App as observation input file (e.g., pseudorange generation)
(+) VMF1
(+) reference trajectory from GPX
(+) multipath detection (code difference) for all frequencies
(+) frequency dependent SNR threshold
(+) ORBEX attitude interpolation
(+) experimental support of RINEX v4
several bugfixes, updated references