Fix some issues reported by lintian

Fix some issues reported by lintian

• Fix field name case in debian/tests/control (Test-command => Test-Command).
• Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Drop unnecessary dependency on dh-autoreconf.
• Remove obsolete field Name from debian/upstream/metadata (already present in machine-readable debian/copyright).
• Update standards version to 4.5.0, no changes needed. (out-of-date-standards-version)

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

You can follow up to this merge proposal as you normally would.

The bot will automatically update the merge proposal to resolve merge conflicts or close the merge proposal when all changes are applied through other means (e.g. cherry-picks). Updates may take several hours to propagate.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/inhomog/e415d113-46a7-406e-9f7b-8920cfa5cb70.

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/17/b057ce8b9053e429725d32cce5e7bbfaa81f66.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/c7/97162fbc7e190d914e9e6076a3d292b49ece71.debug
-rw-r--r--  root/root   /usr/share/doc/libinhomog-dev/examples/inhomog_demo.c

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/12/3b5284d9d6230ee0807520a6120fa115501180.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/46/35bd21e1674b6bb48edf1a7ce1552ad290f186.debug
-rw-r--r--  root/root   /usr/share/doc/libinhomog-dev/examples/inhomog_demo.c.gz

No differences were encountered between the control files of package **inhomog**

Control files of package inhomog-dbgsym: lines which differ (wdiff format)

• Build-Ids: 4635bd21e1674b6bb48edf1a7ce1552ad290f186 17b057ce8b9053e429725d32cce5e7bbfaa81f66

No differences were encountered between the control files of package **libinhomog-dev**

No differences were encountered between the control files of package **libinhomog0**

Control files of package libinhomog0-dbgsym: lines which differ (wdiff format)

• Build-Ids: 123b5284d9d6230ee0807520a6120fa115501180 c797162fbc7e190d914e9e6076a3d292b49ece71

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