Release 1.6 Merge (#73)

* $SnapshotDeepMaintenanceDays = $null disables deep data checks

* updated install binary links to v0.14

* add config point for additional backup parameters

* - backup and maintenance run independently
- fixed issues with several incorrect function return values

* check for new version of restic during maintenance

* removing duplicate excludes, resolves #60

* update restic .exe version
add self-update to the install script

* Release 1.6 Changelog updates

config.ps1

@@ -10,6 +10,7 @@ $LogRetentionDays = 30
 $InternetTestAttempts = 10
 $GlobalRetryAttempts = 4
 $IgnoreMissingBackupSources = $false
+$AdditionalBackupParameters = @("--exclude-if-present", ".nobackup")
 
 # maintenance configuration
 $SnapshotMaintenanceEnabled = $true