modify the sync numbers of 'start_sync' function

Added command line parameter for wallet port for some tests

Port v1.3.1 to develop

includes merge of changes from the release/1.3.x branch in libraries/fc submodule

Release 1.3.1

bump version to 1.3.1

Centos build improvements

Perform rfc2818 on HTTPS connections

add duplicate check for set code/abi/contract

Changed long_running_tests to use different ports to identify why keosd is not starting on mac. GH #5674

Added flag for launcher to set max_transaction_cpu_usage in genesis file and increased parameters for cluster launch. GH #5674

Add options for buying ram in bytes to newaccount, delegatebw and buyram

Fix issue with debug EosioTester builds

allow local CMAKE flags in eosio_build.sh

issues/4573 : Use of $JOBS instead of $CPU_CORE for make -j

Fix return value when throws connection_exception in cleos

Fix build script for Amazon Linux 2

better formatting for stdout
yum package installation separation from SCL + use of rpm -qa to check existence
moved yum update before yum installs
using "Don't repeat yourself" for installations throughout

Using $JOBS instead of the $CPU_CORE on make -j, preventing overuse/memory exhaustion when CPU is much higher than available memory.

This reverts commit 7d8d892e.

This reverts commit ec4ad250.

producer_plugin: Changed "in micro second" to "in microseconds"

Fix bug that creates a gap in the syncing blocks

Microsecond is the correct word: https://en.wiktionary.org/wiki/microsecond
I would suggest plural here, since these are not happening in a microsecond, these are specified in microseconds.