Tahoe Code SVN development

revised C code with cut-off terms removed. Works now. Seeing quadratoic
convergence even with the finite difference approximation to the modulus.

Debugging files. Better functionality but still some strange ehaviors.

(1) fixed error in unit cell coordinates
(2) added debugging statements

final additions to get code compiling and running. Initial test still
returning NaN's from the C code.

disable most development options by default. Can enable for a particular
build using tahoe-manager.

(1) added data
(2) revised parameter defs/inits. Make all parameters required. Do not fill
any default values during TakeParameterList.

working prototypes

additional C sources and headers

use header with common variable declarations/initializations

stress function