Install tqdm by default (release 1.16.1)

[iskandr]

Summary

• Make tqdm>=4.64 a required runtime dependency, so normal datacache installs include progress support without extras.
• Preserve datacache[progress] as a no-op compatibility alias and keep displays opt-in with show_progress=True.
• Keep tqdm lazily imported, update docs and broken-installation errors, and add packaging/import regression tests.
• Prepare the 1.16.1 patch release with matching version, API reference, and changelog.

Review and verification

• Reviewed the local diff: no blocking correctness or compatibility findings.
• Full local suite: 809 tests pass, 93% coverage.
• Focused packaging, progress, import-cost, and API-reference checks pass after the version bump.
• Fresh wheel installation without extras installs tqdm automatically and displays a progress bar.
• Ruff and git diff --check pass.

This does not enable progress displays by default or change cache-hit behavior.

[coveralls]

Coverage Report for CI Build 36875129092

Coverage remained the same at 93.174%

Details

• Coverage remained the same as the base build.
• Patch coverage: 1 of 1 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	2593
Covered Lines:	2416
Line Coverage:	93.17%
Coverage Strength:	7.44 hits per line

---

💛 - Coveralls