Doc string updates only [no CI]

Author: Martin D. Weinberg

expui/BiorthBasis.H

@@ -948,8 +948,12 @@ namespace BasisClasses
   };
 
   /**
-     Uses EmpCylSL basis to evaluate expansion coeffients and provide
+     @brief Uses EmpCylSL basis to evaluate expansion coeffients and provide
      potential and density basis fields
+
+     @note The HDF5 disk basis cache is gzip compressed by default to
+     save disk space. The user may turn off compression using the
+     `compress: 0` parameter, although we have no particular use case.
   */
   class Cylindrical : public BiorthBasis
   {

pyEXP/BasisWrappers.cc

@@ -87,7 +87,10 @@ void BasisFactoryClasses(py::module &m)
     or with the same basis used on previous pyEXP invocations.  At this
     point, you must create the YAML configuration for the basis even if
     the basis is cached.  This is a safety and consistency feature that
-    may be relaxed in a future version.
+    may be relaxed in a future version.  The HDF5 disk basis cache is
+    gzip compressed by default to save disk space. The user may turn off
+    compression using the `compress: 0` parameter, although we have no
+    particular use case.
 
     Coefficient creation
     --------------------

src/Cylinder.H

@@ -122,6 +122,11 @@ class MixtureBasis;
 
     @param dumpbasis set to true dumps the basis to a file for
     diagnostic examination (default: false)
+
+    @param compress sets the HDF5 cache file compression level.  The
+     HDF5 disk basis cache is gzip compressed by default at compress=5
+     to save disk space. The user may turn off compression usin the
+     compress=0, although we have no particular use case.
 */
 class Cylinder : public Basis
 {