make at least q3c_ang2pix parallel safe

scripts/q3c--2.0.0--2.0.1.sql

@@ -0,0 +1,56 @@
+\echo Use "CREATE EXTENSION q3c" to load this file. \quit
+
+# make functions parallel safe
+
+CREATE OR REPLACE FUNCTION q3c_ang2ipix(double precision, double precision)
+        RETURNS bigint
+        AS 'MODULE_PATHNAME', 'pgq3c_ang2ipix'
+        LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
+
+CREATE OR REPLACE FUNCTION q3c_ang2ipix(ra real, decl real)
+        RETURNS bigint
+        AS 'MODULE_PATHNAME', 'pgq3c_ang2ipix_real'
+        LANGUAGE C IMMUTABLE STRICT  PARALLEL SAFE;
+
+CREATE OR REPLACE FUNCTION q3c_ipix2ang(ipix bigint)
+        RETURNS double precision[]
+        AS 'MODULE_PATHNAME', 'pgq3c_ipix2ang'
+        LANGUAGE C IMMUTABLE STRICT  PARALLEL SAFE;
+
+CREATE OR REPLACE FUNCTION q3c_pixarea(ipix bigint, depth int)
+        RETURNS double precision
+        AS 'MODULE_PATHNAME', 'pgq3c_pixarea'
+        LANGUAGE C IMMUTABLE STRIC  PARALLEL SAFET;
+
+
+CREATE OR REPLACE FUNCTION q3c_dist(ra1 double precision, dec1 double precision,
+									ra2 double precision, dec2 double precision)
+        RETURNS double precision
+        AS 'MODULE_PATHNAME', 'pgq3c_dist'
+        LANGUAGE C IMMUTABLE STRICT  PARALLEL SAFE; 
+
+CREATE OR REPLACE FUNCTION q3c_sindist(double precision, double precision,
+                                       double precision, double precision)
+        RETURNS double precision
+        AS 'MODULE_PATHNAME', 'pgq3c_sindist'
+        LANGUAGE C IMMUTABLE STRICT  PARALLEL SAFE COST 100;
+
+CREATE OR REPLACE FUNCTION q3c_sindist_pm(
+       ra1 double precision, dec1 double precision,
+       pmra1 double precision, pmdec1 double precision,
+       cosdec_flag integer,
+       epoch1 double precision, ra2 double precision, dec2 double precision,
+       epoch2 double precision)
+        RETURNS double precision
+        AS 'MODULE_PATHNAME', 'pgq3c_sindist_pm'
+        LANGUAGE C IMMUTABLE  PARALLEL SAFE COST 100;
+
+CREATE OR REPLACE FUNCTION q3c_dist_pm(
+       ra1 double precision, dec1 double precision,
+       pmra1 double precision, pmdec1 double precision,
+       cosdec_flag int,
+       epoch1 double precision, ra2 double precision, dec2 double precision,
+       epoch2 double precision)
+        RETURNS double precision
+        AS 'MODULE_PATHNAME', 'pgq3c_dist_pm'
+        LANGUAGE C IMMUTABLE  PARALLEL SAFE COST 100;