This closes #91 pull request at github/apache/ant

javadoc on Ant classes now conform to the default output format of javadoc tool
(which is HTML5 in recent versions of that tool), so we no longer have to
override the output format to -html4.

This closes #88 pull request at github/apache/ant repo

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

I've decided to break backwards compatibility with the way I've
overridden runS. The "proper" way would have been to call the one-arg
version from the two-arg version so that subclasses overriding runS
would still get their method called. But I figured it to be extremely
unlikely that such subclasses exist.

This closes #84 pull request at github/apache/ant repo

Use valid markup