Trick Simulation Environment 15.2.3

(15.2.0)
Merged er7_utils integrators back into Trick.
Fixed bugs causing simulation to core dump during checkpoint reload
Fixed bug in variable server where bad variable name would cause crash
Fixed bugs in writing/reading checkpoints of array of array of chars.
Removed catching of unknown exceptions allowing system to handle and better show error origin.
Suspended all variable server during checkpoint restart to prevent invalid variable accesses.
Fixed bug preventing Trick to be compiled 32bit on a 64bit machine.
Reworked temperature mathematical calculations in input file.
(15.2.1)
This release fixes the problem where Trick will not compile if the GNU Scientific Library (GSL) interface code is included.
(15.2.2)
This release fixes a code generation bug that prevents simulations from compiling correctly. These sims are trying to exclude code from Trick processing, and Trick was being stubborn about it.
(15.2.3)
This release fixes a bug introduced by the previous checkin regarding paths and symbolic links.