Alexander Slesarenko

In this PR a new DirectCompiler implemented which takes typed AST (after SigmaTyper) and generates ErgoTree expression bypassing GraphBuilding.

A new Global.fromBigEndianBytes[TNum] method should be implemented which can parse big-endian two's complement binary representation of TNum type. The type TNum can be one of Byte, Short, Int, Long, BigInt....

This PR implements reduceTransactionInput, signReducedInput and generateCommitments in SigmaProver for both JVM and JS to support signing of multisig transactions. To that end, the following changes has been done: -...

Add check using isValidIndex in Coll[T] impls

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The check of the argument using isValidIndex is needed for all Coll[T] implementations. This changes the semantics of the operations, thus can only be done in ErgoTree v1. This depend...

Add Numeric.toBits method

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Separated from #486.

Implement Some and None as global methods

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They should be implemented similar to `groupGenerator`. 1) as methods of Global type ``` def Some[T](x: T): Option[T] def None[T]: Option[T] ``` 2) they should be translated to SomeValue, NoneValue...

[6.0] Global.serialize method

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In this PR: - Global.serialize method is added - global operation serialize() is added and translated to Global.serializer method call - Global.serialize is properly compiled to ErgoTree (tests added) -...