Rephrase RPC error messages

I tried to leave out low level details.
A few adjustments were made for consistency.
Indentations were low hanging fruits (based on surrounding code, not overall)
Add error codes of populateRPCTransactionObject
Replace numbers by error codes in populateRPCTransactionObject
temp revert
Merge branch 'mscore-0.0.9' of http://github.com/mastercoin-msc/mastercore into mscore-0.0.9

Conflicts:
	src/mastercore_dex.h

re-added a getBlockTime method after minor mergetool issue
Merge branch 'mscore-0.0.9' of http://github.com/mastercoin-msc/mastercore into mscore-0.0.9

StrToInt64 into separate file and added to boost make check
Fix, workaround for maybe uninitialized variables

Warnings addressed:

mastercore_rpc.cpp:1515:10: warning: ‘valid’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
mastercore_rpc.cpp:1845:9: warning: ‘MPTxTypeInt’ may be used
uninitialized in this function [-Wmaybe-uninitialized]
Merge pull request #179 from dexX7/mcore-warning-gettradessince

Fix, workaround for maybe uninitialized variables
Merge pull request #181 from dexX7/mcore-rpc-refine-errors-add-codes

Refine error messages, add codes to populateRPCTransactionObject
Merge branch 'mscore-0.0.9' of http://github.com/mastercoin-msc/mastercore into mscore-0.0.9

latest formatting changes pull
consolidating matching logic into MetaDExMatch(); renaming some datatypes
version bump
Update to new data structures, getorderbook_MP
Merge pull request #185 from faizkhan00/mscore-009

Update to new data structures, getorderbook_MP
metadex: trade & add working
Initial commit of removal of double
adding a new logging function, testing
name changes
Remove disable-wallet as fails build
Merge pull request #187 from zathras-crypto/0.0.9-Z-RemoveDisableWallet

Remove disable-wallet as fails build