Aligned IniArtifactDescriptorReader with standard Maven behavior and used only GAV for resource lookup

Fixed issues in IniArtifactDataReader (bad exclusions, bad GAV format doc, bad managed dependency scope)

Introduced AbstractForwardingRepositorySystemSession as base class for proxies/decorators

Considered root artifact for detail message of DependencyCollectionException

Tweaked file format for DependencyGraphParser to support more use cases and migrated all graph transformer tests to resource-based graph definitions

Introduced session configuration property "aether.conflictResolver.verbose=true|false" to create desired tree structure during conflict resolution

Partially reverted original fix and restored sharing of child node lists along with docs to explicitly call it out, not only can the new conflict resolver handle this data sharing, it's actually improving performance

Bug 397241 - Conflict resolution miscalculates effective scope for children of nodes with scope conflict

Replaced conceptually flawed JavaEffectiveScopeCalculator and NearestVersionConflictResolver with new ConflictResolver that resolves scope and version conflicts in interleaved way, the new conflict resolver provides hooks to control details of the scope derivation and conflict resolution strategies

Extended CollectRequest to allow specification of root artifact which DefaultDependencyCollector applies as label to root node in case no root dependency is set

Bug 397170 - Artifact descriptor cache employed during dependency collection looses managed dependencies and aliases

Fixed caching to handle missing data

Fixed graph structure created by DefaultDependencyCollector such that each node has its own child list

Fixed service locator to properly handle case where both classes and instances are registered for a given service

Used UTC for timestamp in OSGi version qualifier (generally reasonable and aligns bundle versions with feature versions generated by Tycho's .qualifier expansion)

Tweaked bundle version for snapshots to include timestamp such that OSGi can distinguish one snapshot from another

Enforced use of OSGi-friendly versioning schema to ensure milestone < rc < final release is valid in both Maven and OSGi worlds

Added OSGi/Eclipse headers to manifest of source JARs in preparation for assembly of source feature using Tycho