Add support for -boot flag, which allows in-tree execution of Ur/Web The boot flag rewrites most hardcoded paths to point to the build directory, and also forces static compilation. This is convenient for developing Ur/Web, or if you cannot 'sudo make install' Ur/Web. The following changes were made: * Header files were moved to include/urweb instead of include; this lets FFI users point their C_INCLUDE_PATH at this directory at write <urweb/urweb.h>. For internal Ur/Web executables, we simply pass -I$PATH/include/urweb as normal. * Differentiate between LIB and SRCLIB; SRCLIB is Ur and JavaScript source files, while LIB is compiled products from libtool. For in-tree compilation these live in different places. * No longer reference Config for paths; instead use Settings; these settings can be changed dynamically by Compiler.enableBoot () (TODO: add a disableBoot function.) * config.h is now generated directly in include/urweb/config.h, for consistency's sake (especially since it gets installed along with the rest of the headers!) * All of the autotools build products got updated. * The linkStatic field in protocols now only contains the name of the build product, and not the absolute path. Future users have to be careful not to reference the Settings files to early, lest they get an old version (this was the source of two bugs during development of this patch.)

table u : {C : int, D : int, E : option int, F : string}
  PRIMARY KEY C,
  CONSTRAINT U UNIQUE (C, D),
  CONSTRAINT U2 UNIQUE E,

  CONSTRAINT Pos CHECK D > 0,
  CONSTRAINT NoNo CHECK C + D <> 2,
  CONSTRAINT Known CHECK F = "_E = 6"

table t : {A : int, B : int, C : option int}
  PRIMARY KEY B,

  CONSTRAINT UniA UNIQUE A,
  CONSTRAINT UniB UNIQUE B,
  CONSTRAINT UniBoth UNIQUE (A, B),

  CONSTRAINT UniAm UNIQUE {#A},
  CONSTRAINT UniAm2 {unique [#A] [[]] ! !},
  {{one_constraint [#UniAm3] (unique [#A] [[]] ! !)}},

  CONSTRAINT UniBothm UNIQUE ({#A}, {#B}),
  CONSTRAINT UniBothm2 {unique [#A] [[B = _]] ! !},
  {{one_constraint [#UniBothm3] (unique [#A] [[B = _]] ! !)}},

  CONSTRAINT ForA FOREIGN KEY A REFERENCES u (C),
  CONSTRAINT ForAB FOREIGN KEY (A, B) REFERENCES u (D, C) ON DELETE CASCADE ON UPDATE RESTRICT,
  CONSTRAINT ForBA FOREIGN KEY (A, B) REFERENCES u (C, D) ON UPDATE NO ACTION,
  CONSTRAINT ForB FOREIGN KEY B REFERENCES u (E),
  CONSTRAINT ForC FOREIGN KEY C REFERENCES u (C),

  CONSTRAINT Self FOREIGN KEY B REFERENCES t (B)

table s : {B : option int}
  CONSTRAINT UniB UNIQUE B

table s2 : {B : option int}
  CONSTRAINT ForB FOREIGN KEY B REFERENCES s (B) ON DELETE SET NULL

fun main () : transaction page =
    queryI (SELECT * FROM t) (fn _ => return ());
    return <xml/>