HPCC-10245 Add current tests which pass

Add 319 test cases from the old regression suite. All of them passed on all
clusters: thor, hthor and roxie or excluded from one or two.

Change regression suite code to simplified usage:

Add ‘.’ (current directory) to default value of –suiteDir parameter in run.
Add thor to default value of –cluster parameter in query.

Sort the testcases before run a suite to solve dependency like aaalibrary2.ecl
for library2.ecl

Add new //publish tag to publised compiled testcase, especially for external
libraries (e.g: aaalibrary2.ecl, etc).

Update README.rst.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>