+/*******************************************************************************
+COMMENTS, REFERENCES, and NOTES
+*******************************************************************************/
+/**
+This class models the stability derivative coefficient lookup tables or
+equations. Note that the coefficients need not be calculated each delta-t.
+
+The coefficient files are located in the axis subdirectory for each aircraft.
+For instance, for the X-15, you would find subdirectories under the
+aircraft/X-15/ directory named CLIFT, CDRAG, CSIDE, CROLL, CPITCH, CYAW. Under
+each of these directories would be files named a, a0, q, and so on. The file
+named "a" under the CLIFT directory would contain data for the stability
+derivative modeling lift due to a change in alpha. See the FGAircraft.cpp file
+for additional information. The coefficient files have the following format:
+
+<name of coefficient>
+<short description of coefficient with no embedded spaces>
+<method used in calculating the coefficient: TABLE | EQUATION | VECTOR | VALUE>
+ <parameter identifier for table row (if required)>
+ <parameter identifier for table column (if required)>
+<OR'ed list of parameter identifiers needed to turn this coefficient into a force>
+<number of rows in table (if required)>
+<number of columns in table (if required)>
+
+<value of parameter indexing into the column of a table or vector - or value
+ itself for a VALUE coefficient>
+<values of parameter indexing into row of a table if TABLE type> <Value of
+ coefficient at this row and column>
+
+<... repeat above for each column of data in table ...>
+
+As an example for the X-15, for the lift due to mach:
+<PRE>
+
+CLa0
+Lift_at_zero_alpha
+Table 8 3
+16384
+32768
+16387
+
+0.00
+0.0 0.0
+0.5 0.4
+0.9 0.9
+1.0 1.6
+1.1 1.3
+1.4 1.0
+2.0 0.5
+3.0 0.5
+
+30000.00
+0.0 0.0
+0.5 0.5
+0.9 1.0
+1.0 1.7
+1.1 1.4
+1.4 1.1
+2.0 0.6
+3.0 0.6
+
+70000.00
+0.0 0.0
+0.5 0.6
+0.9 1.1
+1.0 1.7
+1.1 1.5
+1.4 1.2
+2.0 0.7
+3.0 0.7
+</PRE>
+
+Note that the values in a row which index into the table must be the same value
+for each column of data, so the first column of numbers for each altitude are
+seen to be equal, and there are the same number of values for each altitude.
+
+<PRE>
+FG_QBAR 1
+FG_WINGAREA 2
+FG_WINGSPAN 4
+FG_CBAR 8
+FG_ALPHA 16
+FG_ALPHADOT 32
+FG_BETA 64
+FG_BETADOT 128
+FG_PITCHRATE 256
+FG_ROLLRATE 512
+FG_YAWRATE 1024
+FG_ELEVATOR 2048
+FG_AILERON 4096
+FG_RUDDER 8192
+FG_MACH 16384
+FG_ALTITUDE 32768L
+</PRE>
+@author Jon S. Berndt
+@memo This class models the stability derivative coefficient lookup tables or equations.
+*/
+/*******************************************************************************
+CLASS DECLARATION
+*******************************************************************************/
+