Qrule update

Version 4.0

Why these updates?
    • fix bugs as they become known
    • enhance ease of use for classroom applications

Updates include
    1. fixed problem with masked model (option 'X') that caused program to hang

    2. data set upgrades including
    	patch_cfd.dat now has indicators for habitat type and iteration 
        stats.csv is a comma-deliminted output file of analysis results
            output results for each iteration and habitat type

    3. Improved sizeit.f90 and patchid.f90 (6.22.09).  Changes include:
	    a. wk_map over-dimensioned so that neighborhood function can read off map area
	        allowing edge checks to be eliminated in cluster identification routines.
	    b. push altered -- stack check for duplicates no longer necessary
	    c. edge checks in site_label eliminated
    
    4. Development of R routines to analyze/plot results -- see web site 

    5. Added RwC model -- masked-simple random routine (select option 'Y') 
        see manuscript
        
    5. Fixed Chi-Square bug (divide by zero when counts for a particular habitat type wore = 0)



