Dev/reg bit change no validate (#970)

- do not validate write reg, setbit and clearbit by default anymore
- --validate will force validation on the bitmask or entire reg
- remove return value for write reg (across server to client, but thankfully not in the Detector class)
- extend validation into writereg, setbit and clearbit for Eiger (always special)
-  need to check python (TODO)
- missed the rx_zmqip implementations in detector.h and python bindings

slsDetectorServers/slsDetectorServer/src/nios.c

@@ -82,10 +82,7 @@ void setU64BitReg(uint64_t value, int aLSB, int aMSB) {
 
 u_int32_t readRegister(u_int32_t offset) { return bus_r(offset); }
 
-u_int32_t writeRegister(u_int32_t offset, u_int32_t data) {
-    bus_w(offset, data);
-    return readRegister(offset);
-}
+void writeRegister(u_int32_t offset, u_int32_t data) { bus_w(offset, data); }
 
 int mapCSP0(void) {
     u_int32_t csps[2] = {CSP0, CSP1};