JBIDE-15280 Update parent/pom.xml version to 4.2.0.Alpha1

update version for parent pom.xml 4.1.0.CR1-SNAPSHOT -> 4.2.0.Alpha2-SNAPSHOT
Import Maven Archetype Project Example ignores JBoss Maven Integration preferences

remove code disabling configurators
JBIDE-11319: Url for Eclipse-SourceReferences
JBIDE-15173 - Typo: cheatsheets > cheat sheets
JBDS-2702 forgot to update the pom.xml as well as the default hard-coded in the DefaultJBossCentralConfigurator, so JBT 4.1.0.Final users will see Discovery content from latest milestone site instead of stable release site. Can fix this in 4.1.1; in master, add more comments so we avoid a partial fix next time