Fix line length, add preimage to HTLC virtual operation

[jmjatlanta]

Problem 1: htlc_redeem_operation virtual operation was not storing the preimage. Fixed in htlc.hpp::htlc_redeemed_operation constructor, and tested in cli_test/main.cpp

      struct htlc_redeemed_operation : public base_operation
      {
         htlc_id_type htlc_id;
         account_id_type from, to, redeemer;
         asset amount;
         htlc_hash htlc_preimage_hash;
         uint16_t htlc_preimage_size;
         asset fee;
         std::vector<char> preimage;
      };

Problem 2: Some of the lines modified as part of BSIP 64 are too long, and should be wrapped.

Problem 3: Only 50 characters were displayed as part of operation history. It is believed that number is too small. Increased to 300. See operation_printer.cpp::print_preimage

Fixes #2160

[abitmore]

Thanks. Waiting for CI results.

[abitmore]

Travis CI failed to build cli_test:

/home/travis/build/bitshares/bitshares-core/tests/cli/main.cpp:1762:99: error: ‘BOOST_TEST’ was not declared in this scope
BOOST_TEST( hist[0].description.find("with preimage "4d792") != hist[0].description.npos);

CI failed

[jmjatlanta]

Travis CI failed to build cli_test:

/home/travis/build/bitshares/bitshares-core/tests/cli/main.cpp:1762:99: error: ‘BOOST_TEST’ was not declared in this scope
BOOST_TEST( hist[0].description.find("with preimage "4d792") != hist[0].description.npos);

BOOST version difference. I'll get it fixed.

[abitmore]

Thanks.