These declarations and calls compile but do not link.
g++ linker aborts after the first complaint:
E.g., ../src/nodeops.cc:936: undefined reference to 
	`doSRNBDA3(float*, float*, unsigned long, XButtonEvent*)'
After commenting out prior calls, the next one aborts the linker.
TBD: rename the parameters of each doSRN* function pctrx not &ctrx, etc.


[mercury2](63)> cat doSRNrefs080524.0056
cat doSRNrefs080524.0056 (w/o  comments)

357:void doSRNBDA3( float* ctrx, float* ctry, hcg_key id, XButtonEvent* event);
358:void doSRN1BMA1(float *ctrx, float *ctry, hcg_key id, XButtonEvent* event);
359:void doSRN1BUA1(float *ctrx, float *ctry, hcg_key id, XButtonEvent *event);

936:                    doSRNBDA3(&ctrx, &ctry, localid, event);
1005: 			doSRN1BMA1(&ctrx, &ctry, localid,event); //RJL080503
1023:                 	doSRN1BUA1(&ctrx, &ctry, localid, event);

1055:void doSRNBDA3(float* &ctrx, float* &ctry,  
			hcg_key localid, XButtonEvent * event)
1092:void doSRN1BUA1(float* &ctrx, float* &ctry, 
			hcg_key localid, XButtonEvent *event)
1151:void doSRN1BMA1(float* &ctrx, float* &ctry,  
			hcg_key localid, XButtonEvent * event)