Commits on Apr 28, 2018

1. Add support for platform-defined standard directories …

   This change stops cargo from violating the operating system rules
   regarding the placement of config, cache, ... directories on Linux,
   macOS and Windows.
   
   Existing directories and overrides are retained.
   
   The precedence is as follows:
   
   1) use the `CARGO_HOME` environment variable if it exists (legacy)
   2) use `CARGO_CACHE_DIR`, `CARGO_CONFIG_DIR` etc. env vars if they exist
   3) use the ~/.cargo directory if it exists (legacy)
   4) follow operating system standards
   
   A new cargo command, `dirs`,  is added, which can provide path
   information to other command line tools.
   
   Fixes:
     rust-lang#1734
     rust-lang#1976
     rust-lang/rust#12725
   
   Addresses:
     rust-lang/rfcs#1615
     rust-lang#148,
     rust-lang#3981

   

   soc committed Apr 28, 2018
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