xxmData: support alphanumeric primary keys
demo 10,11, fix UsesClause
demo 9 upload progress: abort uploads on reload project
demo 7,8,9; some important fixes
more demo's
xxm2: demo 3 (SQLite)
d10: demo's 1, 2
project registry a-b-lookup
fixed bug in xxmPReg when removing a project from xxm.json
handler switch to CXxmContext; xxmHttpDev