Fixed Glonass MFtime in Rinex 2.11 store\read\write mismatch

[eugenyk]

Suppose we have a rinex file

     2.11           GLONASS NAV DATA                        RINEX VERSION / TYPE
ASRINEXG V1.1.0 VM  AIUB                19-FEB-98 10:42     PGM / RUN BY / DATE 
STATION ZIMMERWALD                                          COMMENT             
                                                            END OF HEADER       
13 90  1  2  0  4  0.0 1.230000000000e-01 1.231100000000e+02 1.540000000000e+02 
    1.100000000000e+00 4.100000000000e+00 6.100000000000e+00 1.200000000000e+01 
    2.100000000000e+00 5.200000000000e+00 6.100000000000e+00 1.230000000000e+02 
    3.100000000000e+00 6.300000000000e+00 6.900000000000e+00 1.255500000000e+01 

and if we read it via Rinex3NavData then save it with Rinex3NavData when we get this rinex file

      2.11          NAVIGATION                              RINEX VERSION / TYPE
ASRINEXG V1.1.0 VM  AIUB                20150216 071100 UTC PGM / RUN BY / DATE
STATION ZIMMERWALD                                          COMMENT
                                                            END OF HEADER
13 90  1  2  0  4  0.0 1.230000000000e-01 1.231100000000e+02 1.729540000000e+05
    1.100000000000e+00 4.100000000000e+00 6.100000000000e+00 1.200000000000e+01
    2.100000000000e+00 5.200000000000e+00 6.100000000000e+00 1.230000000000e+02
    3.100000000000e+00 6.300000000000e+00 6.900000000000e+00 1.255500000000e+01

look at 1.540000000000e+02 and 1.729540000000e+05 values. It is the mismatch.

It happens because of https://github.com/SGL-UT/GPSTk/blob/master/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp#L1204

we store it fixed, but when we are writing it https://github.com/SGL-UT/GPSTk/blob/master/core/lib/FileHandling/RINEX3/Rinex3NavData.cpp#L956
we don't make the reverse operation.

[masamitsutech]

Before this pull request can be reviewed for the next stable release, please update the branch to resolve possible merge conflicts.