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in clean-classic for linux-arm64 remove txt/install.sh and txt/make.sh, use install_no_profile.sh and make.sh from stdenv repository instead

in clean-classic for linux-x64, linux-x86 and macos-x64 remove txt/install.sh and txt/make.sh, use install.sh and make.sh from stdenv repository instead

update Tools/*.py scripts to python3

Closes #45

See merge request !69

add clean-language-report target

Closes #46

See merge request !70

in clean-classic for macos-x64 add _SystemDynamic and StdDynamic to StdEnv, remove Dynamics directory, use gast repository

in clean-classic for linux-x64, linux-x86 and macos-x64 remove txt/_startupTrace.dcl and txt/_startupProfile.dcl, copy _startup.dcl instead

in clean-classic for linux-x64 and linux-x86 remove txt/clm.1, instead use clm.1 from clm repository

in clean-classic for linux-arm64 remove txt/Makefile_stdenv, use Makefile_no_trace.linux from stdenv instead

Use git rev-list --first-parent when checking out git repositories when CLEANDATE is set

See merge request !71

This way we only check out a previous state of the requested branch.
For example, if the history looks like:

* (merge) commit 4
|\
| * commit 3
| |
| * commit 2
|/
* commit 1

If a commit before 3 is requested, previously, commit 2 would be
selected. With --first-parent, we only follow the left path, and commit
1 is selected. This avoids checking out the intermediate state on a
feature branch.

in clean-classic for macos-x64 build in root directory of this workspace instead of clean-classic/macos-x64

in clean-classic for linux-x86 build in root directory of this workspace instead of clean-classic/linux-x86