Eliminate deprecated lib records APIs

[zwoop]

These are both obsoleted, and confusing to have around:

RecInt REC_readInteger(const char *name, bool *found, bool lock = true);
RecFloat REC_readFloat(char *name, bool *found, bool lock = true);
RecCounter REC_readCounter(char *name, bool *found, bool lock = true);
RecString REC_readString(const char *name, bool *found, bool lock = true);

RecInt REC_ConfigReadInteger(const char *name);
char *REC_ConfigReadString(const char *name);
RecFloat REC_ConfigReadFloat(const char *name);
RecCounter REC_ConfigReadCounter(const char *name);

[zwoop]

Moving this out to 9.1.x, I still think should be done.

[ShaiviAgarwal2]

@zwoop I need to work on this issue. Could you please assign this work to me!!