Moved gromacs module from mdevaluate to pygmx

pygmx/gromacs/compression.h

@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+int
+xdrfile_decompress_coord_float(float     *coordinates,
+                               int       size,
+                               float     precision,
+                               int       minint[3],
+                               int       maxint[3],
+                               int       smallidx,
+                               int *     compressed_blob,
+                               size_t    blob_len,
+                               size_t *  readed_len);