#48 improve compile-time performances

[Lorenzo Caminiti]

Right now it take x 30 to compile with all contracts enabled with respect to contract disabled!
1) Profile the code and analysis reason for long compilation time.
2) Reduce compilation time.

Contracts off:
1) Preprocess
2) Expand original function declaration
3) Compile original code

Contracts on:
1) Preprocess
2) Expand contract code + original function declaration
3) Compile contract code + original code

Which step(s) is taking so long?

[Lorenzo Caminiti]

• priority changed from blocker to critical

[Lorenzo Caminiti]

• status changed from new to accepted

[Lorenzo Caminiti]

• milestone changed from Future to 1.2.0