'ant install' must know the debug apk filename so newer naming scheme breaks
on older rule files (1.5 and earlier).
The fix is to check for the presence of the property naming the debug,
signed, unaligned package. If the property is present, then we use
the new naming scheme ({base}[-{config}]-debug-unaligned.apk), else we use
the old one ({base}-[-{config}]-debug.apk).

Also merge the install/reinstall targets, since 'adb install -r <file>'
works even if the apk was not yet installed.

DO NOT MERGE

It will also align debug builds.
BUG: 2052744

If the Ant project is targetting a preview platform, the manifest must
declare minSdkVersion to be the platform codename.

ro.build.version.codename is a new property indicating whether a platform
is in its release form (value = REL) or in development (value = dev branch
name such as Donut). When the codename indicates a development/preview version
then the API level must be ignored and this codename is used as a unique
identifier of the platform.

IAndroidTarget has been changed to return an instance of a new class
AndroidVersion instead of the api level directly. This class helps deals with
the logic of comparing version from targets or devices.

This change impacts all of the sdk manager to deal with targets identified by
codename instead of api level. This in turn impacts everything that relies
on the sdkmanager: ADT (build, launch, project creation), the AVD manager,
the SDK updater.

- com.android.sdklib.avd -> com.android.sdklib.internal.avd
- com.android.sdklib.project -> com.android.sdklib.internal.project