initial empty check-in
string interning. Base class, and in-memory store.
sqlite based store, incomplete
Added API method "exists", clarified return of "map"
Added cache storage package.
Merged new main features.
Fixed API (result) of sqlite's "map".
Requirement bugfixes, size fix. Start of a testsuite.
Completed basic testsuite. Associated bug fixes.
Merge testsuite.
Testsuite for sqlite store. Bug fixes. Generalizations in test code, and class hierarchy.
Fixed result differences in the shared test cases, more procedures providing the differences. Made the test case names in the shared suite unique per store.