changed another -9999 to -999 in extractAdmin;
re did thresholding of presence in extractBhatt, this time using calc, rather than setValuesIdx which automatically makes non-replaced values NA;
removed setValuesIdx because of above issue
icanhazmerge?

Merge branch 'master' of https://github.com/SEEG-Oxford/seegSDM

Conflicts:
	R/seegSDM.R