Clarify solc unavailable message
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- Dominant language
- Python
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- 195
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- 77
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Description
### What was wrong?
The error message is not clear, when solc isn't available.
Examples:
- https://ethereum.stackexchange.com/questions/26192/errno-2-no-such-file-or-directory-solc-using-py-solc-and-solidity
- https://github.com/ethereum/web3.py/issues/467
Proposal: catch and reraise the exception with a note saying something like:
> The command line tool `solc` wasn't found. Try `python -m solc.install v0.4.17` or see http://solidity.readthedocs.io/en/latest/installing-solidity.html
#### Cute Animal Picture
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