'Transactional' package extraction

[maraf]

Package extract should succeed as an unit or any partial outputs should be deleted in case of exception.

[maraf]

Todays tought:
Use kind of a transaction log.

Installation

• Save package id and version.
• After each file extraction, save a path to log.
• Write entry to packages.config and delete transaction log.

Unstallation

• Save package id and temp directory patb.
• Copy each file to temp directory.
• Remove entry from packages.config.
• Delete temp directory.

Check transaction log on PackageManager start.