1.00: initial version
1.01: added gen_bfield_snapshot.
1.02: whoops, left some codes out of the release.
1.03: snapshot version
1.04: properly reads < 4 blocks at the end of the file.  runtime
  filter is no longer supported.
1.05: require at least two blocks be read.  There is code in read_raw_mfe
  that assumes that at least two blocks are read, so this is the Q&D fix.
1.06: read B_HIGH_STATUS from level1 file.  MFE indicates that the whole
  major frame is invalid.
1.07: sense fill in raw mfe data, which is (bx=-32768,by=-32768,bz=-32768).
1.08: added nobmag keyword which allows the uncorrected angles to be
   recovered.
1.09: hyd_cdf_varget handles endian problems on solaris x86 platform.
1.10: case where there is no valid mfe timetags is handled properly again.
1.11: Rewrote hyd_filter_angle for constant angle case.
1.12: lag_correction is the default now.
1.13: uses hyd_mfe_offset if available.
1.14: lag_correct default can be turned off.
1.15: added more information to the verbose output.  checks getenv('verbose')
1.16: mfe's calibration is always used if available. added more information
  to verbose output in read_raw_mfe.pro
1.17: interpolate across data gaps.
1.18: fixed 1.17.
1.19: ditto.
1.20: Spin_rate now is the 24Hr average.
1.21: S/C Phase now anchored to Sun Times.
1.22: Spin period between sun times now calculated using 5min average.
1.23: Spin period calculation modified to work with other codes.
1.24: calibration can be passed in, or passed out (matrix_in, matrix_out, etc)
v1_25: added release method, also fill_in control.
v1_26: think release is working under cvs.
v1_27: fixed whoops in releasev
v1_28: official release to public areav
v1_29: reinstalled bug fix for phase_out.
v1_30: bug fix in hd_spin_period.
v1_31: bug in release?
v1_32: Bug Fix in hd_spin_period, nrec in sun_timep.
v1_33: Bug fix in release for different users.
v1_34: Bug fix in release
v1_35: Mod perigee detection.
v1_36: Work on hd_sun_time, perigee pass, missing data, etc.
v1_37: fixed problem where block_mjf is not synced to b_high_time, so
  syncing is done if necessary.
v1_38: added science mode
v1_39: fill in only over gaps of less than one minute.
v1_40: use hyd_findex, not jbf_findex.
v1_41: Long loop indices in bmag_8hz_nolag.
v1_42: fixed (I think) test on nobmag and nocorrect.

v1_43:Protected against nonexistence of bflags in get_hr_bmag.
