new attributes ignoremissingbuildfiles and genericantfile
genericantfile allows to run the same build file with different base dirs
it is not compulsory any more to set the attribute target to quote quote to run the default target
PR: 18715
Submitted by: Andreas Ames (Andreas dot Ames at tenovis dot com)


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274600 13f79535-47bb-0310-9956-ffa450edef68

PR:19181


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274581 13f79535-47bb-0310-9956-ffa450edef68

fileset without failonerror, rather than a subant on a dirset
Submitted by:	Dominique Devienne


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274579 13f79535-47bb-0310-9956-ffa450edef68

PR:19181 docs of subant task


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274569 13f79535-47bb-0310-9956-ffa450edef68

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@274316 13f79535-47bb-0310-9956-ffa450edef68