Ex_1 - 2D VanGeel and Sykes Lab experiment

NOTE: executable (2D_90NEW.exe) compiled with  i_static  = 0 (see updates.pdf)
BC input files are set up assuming i_static = 0.

Problem involves 3 stress periods
	1. T = 0 to T = 63000, drop water table
	2. T = 63000 to T = 64120 inject LNAPL
	3. T = 64120 to 66000 allow LNAPL to migrate

Use one main input file to define all stress periods.

See documentation, page 153 for description.
