Schema: change units of tleSystem bstar term

The units of this term have changed in the TCS DTD to inverse
earth radii:

<!-- The BSTAR drag term. Units: Inverse earth radii -->
<!ELEMENT bstar (#PCDATA)>
Schema: tleSystem now uses mm instead of n

The TCS DTD now uses mm for the TLE mean motion term in place of
the "n" term shared with the conicSystem:

<!-- The mean motion term. Units: Revs/day -->
<!ELEMENT mm (#PCDATA)>
Rename TLE LorM to MeanAnomaly

The TCS XML element is called LorM but in the case of TLE it
will only contain M (mean anomoly).  Therefore change the OT's
internal name for it to make the code clearer.
Merge branch 'schema'
Change TLE element n to mm (mean motion)
Update units displayed on the TLE panel

The units for bstar and mean motion have been updated to match
those in the latest version of the schema.