hg: kulla/dev/langtools: Add external editor support. Add /seteditor command. Change editor update comparison to snippet source level -- no false updates. Also: rename to /setstart and /savestart.

[robert.field at oracle.com]

Changeset: c494956a47d5
Author:    rfield
Date:      2015-04-02 00:04 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/c494956a47d5

Add external editor support. Add /seteditor command. Change editor update comparison to snippet source level -- no false updates.  Also: rename to /setstart and /savestart.

! repl/src/tool/EditPad.java
+ repl/src/tool/ExternalEditor.java
! repl/src/tool/Repl.java
! repl/testng/test/CommandCompletionTest.java
! repl/testng/test/ToolBasicTest.java