checking in some WIP

* added some netx funcs
* added netx/dnsx
* currently updating docs and adding *x funcs to sprigx

netx/dnsx/errors.go

@@ -0,0 +1,12 @@
+package dnsx
+
+import (
+	`errors`
+)
+
+var (
+	ErrBadChars    error = errors.New("netx/dnsx: invalid characters/encoding were encountered")
+	ErrBadLabelLen error = errors.New("netx/dnsx: a label with invalid length was encountered")
+	ErrBadPtrLen   error = errors.New("netx/dnsx: a PTR record with invalid length was encountered")
+	ErrBadPtrRoot  error = errors.New("netx/dnsx: a PTR record with invalid root encountered")
+)