javadoc in our classes don't yet comply to html5 semantics. When
generating javadocs for our project, using JDK 11, we run into
build failures since JDK 11 javadoc tool defaults to html5 output
and is strict if the classes don't comply to the semantics.

The commit here explicitly sets the output to html4 to avoid such
failures, till we fix our javadoc to comply with html5

The Apache release process no longer recommends using SHA1 checksums
for artifacts http://www.apache.org/dev/release-signing.html#sha1.
The commit here removes generation of SHA1 for Ant distribution artifacts.

Furthermore, the checksum generation for artifacts that we upload to
Maven is also now removed, since the Nexus instance generates those dynamically
when the artifacts are uploaded to Nexus as stated at
http://www.apache.org/dev/publishing-maven-artifacts.html#prepare-release :
"You don't need artifacts for your checksum files (if you create any) since Nexus
 will create MD5 and SHA1 checksums on the fly anyway."

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Merge tag 'rel/1.9.14' into 1.9.x branch

Tagging version 1.9.14 of Ant

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 =7+xL
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Merge tag 'rel/1.10.5' and prepare next iteration

Tagging version 1.10.5 of Ant

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 =DDUD
 -----END PGP SIGNATURE-----

Merge tag 'rel/1.10.4' and prepare next iteration

Tagging version 1.9.12 of Ant

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 =6HST
 -----END PGP SIGNATURE-----

Merge tag 'rel/1.9.12' into 1.9.x and prepare for next cycle

Tagging version 1.9.12 of Ant

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Merge tag 'rel/1.10.3'

Tagging version 1.10.3 of Ant

# gpg: WARNING: unsafe permissions on homedir '/home/stefan/.gnupg'
# gpg: keyserver option 'ca-cert-file' is obsolete; please use 'hkp-cacert' in dirmngr.conf
# gpg: keyserver option 'no-try-dns-srv' is unknown
# gpg: Signature made Di 27 Mär 2018 20:20:02 CEST
# gpg:                using DSA key A2115AE15F6B8B72
# gpg:                issuer "bodewig@apache.org"
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: key 0000000000000000 occurs more than once in the trustdb
# gpg: Good signature from "Stefan Bodewig <bodewig@apache.org>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan.bodewig@freenet.de>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan@samaflost.de>" [ultimate]
# Primary key fingerprint: CE80 75A2 5154 7BEE 249B  C151 A211 5AE1 5F6B 8B72

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 =bpKK
 -----END PGP SIGNATURE-----

Merge tag 'rel/1.9.11' into 1.9.x

Tagging version 1.9.11 of Ant

# gpg: WARNING: unsafe permissions on homedir '/home/stefan/.gnupg'
# gpg: keyserver option 'ca-cert-file' is obsolete; please use 'hkp-cacert' in dirmngr.conf
# gpg: keyserver option 'no-try-dns-srv' is unknown
# gpg: Signature made Di 27 Mär 2018 20:18:48 CEST
# gpg:                using DSA key A2115AE15F6B8B72
# gpg:                issuer "bodewig@apache.org"
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: Oops: keyid_from_fingerprint: no pubkey
# gpg: key 0000000000000000 occurs more than once in the trustdb
# gpg: Good signature from "Stefan Bodewig <bodewig@apache.org>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan.bodewig@freenet.de>" [ultimate]
# gpg:                 aka "Stefan Bodewig <stefan@samaflost.de>" [ultimate]
# Primary key fingerprint: CE80 75A2 5154 7BEE 249B  C151 A211 5AE1 5F6B 8B72

This closes #57 pull request at github/apache/ant repo

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Merge tag 'rel/1.10.2' and prepare for next iteration

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Merge tag 'rel/1.9.10' into 1.9.x and prepare next iteration