add DisplayRules, docs, doc tests, ..

this includes `trait DisplayRules` as a generic mechanism to control
parts of instruction printing, a `DefaultRules` for the existing
formatting style, and `AbsoluteAddressFormatter` to print instructions
as at some location in an address space.

1 files changed, 1 insertions, 0 deletions

diff --git a/test/real_mode/display.rs b/test/real_mode/display.rs
new file mode 100644
index 0000000..0769351
--- /dev/null
+++ b/test/real_mode/display.rs
@@ -0,0 +1 @@
+mod display_rules;