Results 4 issues of cadaniluk

When running `blockify` without any arguments, I get: ``` Traceback (most recent call last): File "/usr/bin/blockify", line 11, in load_entry_point('blockify==3.6.3', 'console_scripts', 'blockify')() File "/usr/lib/python3.6/site-packages/blockify/cli.py", line 605, in main cli.start() File...

In libff, both `common/double.cpp` and `algebra/fields/field_utils.tcc` define the constant `PI` as const double PI = 3.141592653589793238460264338328L; But isn't the `0` wrong? As [this website says](http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits.html), for example, it is (rounded)...

## Bug Report I built the `wallet_new` branch with `./autogen.sh && ./configure --enable-debug && make check`. Running tests with `./tests`: ``` PASSED - test_sha_256() PASSED - test_sha_512() PASSED - test_sha_hmac()...

Branch is `wallet_new`. Test Log: ``` PASSED - test_sha_256() PASSED - test_sha_512() PASSED - test_sha_hmac() PASSED - test_utils() PASSED - test_cstr() PASSED - test_buffer() PASSED - test_serialize() PASSED - test_memory()...