Fix some issues reported by lintian

Fix some issues reported by lintian

• Remove 1 obsolete maintscript entry.
• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)
• Update standards version to 4.6.1, no changes needed. (out-of-date-standards-version)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)
• Set upstream metadata fields: Repository. (upstream-metadata-missing-repository)

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/38/c184484f5401dcd91051de707dcb8fffd8eaf9.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/bb/6960b048cb6a18ef6ae9caec5646f96a89a54c.debug
-rwxr-xr-x  root/root   DEBIAN/postinst
-rwxr-xr-x  root/root   DEBIAN/postrm
-rwxr-xr-x  root/root   DEBIAN/preinst
-rwxr-xr-x  root/root   DEBIAN/prerm

Control files of package nabi: lines which differ (wdiff format)

• Depends: libc6 (>= 2.14), 2.34), libgdk-pixbuf-2.0-0 (>= 2.22.0), libglib2.0-0 (>= 2.35.9), libgtk2.0-0 (>= 2.24.0), libhangul1 (>= 0.1.0), libice6 (>= 1:1.0.0), libpango-1.0-0 (>= 1.14.0), libsm6, libx11-6

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

• Build-Ids: bb6960b048cb6a18ef6ae9caec5646f96a89a54c 38c184484f5401dcd91051de707dcb8fffd8eaf9

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/nabi/a515b773-84a0-4ea4-85be-356fb3714691.