Allow accessing toolversion at runtime and increase it

Add support for storing user data in a solv file
Improve choice rule generation

Update to 0.7.20
new SOLVER_EXCLUDEFROMWEAK job to ignore pkgs for weak dependencies
support for environments in comps parser
fix misparsing of '&' in attributes with libxml2
choice rules: treat orphaned packages as newest
fix compatibility with Python 3.10

Update to 0.7.19
repo_add_conda: add flag to skip v2 packages
fix rare segfault in resolve_jobrules() that could happen if new rules are learnt
fix error handling in solv_xfopen_fd()
fix memory leaks

Fix rpm dependency

Update to 0.7.17
selected bug fixes:
new features:

Enable zstd compression in libsolv

Update to 0.7.16
selected bug fixes:
new features

Update to 0.7.11
selected bug fixes:
new features

Update to 0.7.7
selected bug fixes:
new features

Backport patches: Use OpenSSL for computing hashes (RhBug:1630300)

Backport patch: Not considered excluded packages as a best candidate (RhBug:1677583)

soname bump to "1"
incompatible API changes:
new functions:
new repowriter interface to write solv files allowing better
support for filtered file lists with a custom filter
dropped support of (since a long time unused) REPOKEY_TYPE_U32
selected bug fixes:
new features:

Backport patch to add support for modular updateinfoxml data

Backport patches for: Install of update of nss.x86_64 adds i686 into transaction (RhBug:1663136)

Backport patch: Fix memory leaks, memory access, not used values