A recent patch fixed Fujitsu test case 0561_0168 by emitting a leading
space for "bare" (no width 'w') I and G output editing of integer
values. This fix has broken another Fujitsu test case (0561_0168), since
the leading space should not be produced at the first column of the
output record. Adjust.
For Fujitsu test case 0561/0561_0168.f90, adjust both input and output
sides of the extension I (and G) edit descriptors with no width (as
distinct from I0/G0). On input, be sure to halt on a separator character
rather than complaining about an invalid character; on output, be sure
to emit a leading space.
Mostly mechanical changes in preparation of extracting the Flang-RT
"subproject" in #110217. This PR intends to only move pre-existing files
to the new folder structure, with no behavioral change. Common files
(headers, testing, cmake) shared by Flang-RT and Flang remain in
`flang/`.
Some cosmetic changes and files paths were necessary:
* Relative paths to the new path for the source files and
`add_subdirectory`.
* Add the new location's include directory to `include_directories`
* The unittest/Evaluate directory has unitests for flang-rt and Flang. A
new `CMakeLists.txt` was introduced for the flang-rt tests.
* Change the `#include` paths relative to the include directive
* clang-format on the `#include` directives
* Since the paths are part if the copyright header and include guards, a
script was used to canonicalize those
* `test/Runtime` and runtime tests in `test/Driver` are moved, but the
lit.cfg.py mechanism to execute the will only be added in #110217.
