Allow tests to be run outside of rakudo dir

Absolutify lib paths and file paths using $?FILE.IO.parent(...),
since a test can know the file layout of its own repo but not the
cwd the user is invoking a test from.

This allows you to install perl6, clone the roast anywhere you
wish, and then run the spectest with:
prove -v -e 'perl6' path/to/roast/*.t

fudging still needs to be done:
perl fudgeall rakudo.moar **/*.t > test-list-spaces.txt
perl -p -e 's/\s+/\n/g' test-list-spaces.txt > test-list.txt
prove --ignore-exit -r -j4 -e 'perl6' - < test-list.txt

This doesn't handle the spectest.data list since it does not exist
in this repo. The important step here is simply getting out of
the rakudo repo, which makes parallel build system stuff possible.

Author: ugexe

MISC/bug-coverage-stress.t

@@ -1,5 +1,5 @@
 use v6.c;
-use lib <t/spec/packages>;
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 

S01-perl-5-integration/eval_lex.t

@@ -1,5 +1,5 @@
 use v6;
-use lib <t/spec/packages/>;
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 plan 2;

S02-literals/allomorphic.t

@@ -1,7 +1,7 @@
 # S02-literals/allomorphic.t --- Tests for the various allmorphic types, and val() processing
 
 use v6;
-use lib 't/spec/packages';
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 

S02-literals/heredocs.t

@@ -1,5 +1,5 @@
 use v6;
-use lib <t/spec/packages/>;
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 plan 34;

S02-literals/pairs.t

@@ -1,6 +1,6 @@
 use v6;
 
-use lib 't/spec/packages';
+use lib $?FILE.IO.parent(2).add("packages");
 
 use Test;
 use Test::Idempotence;

S02-literals/quoting.t

@@ -1,6 +1,5 @@
 use v6;
-use lib <t/spec/packages>;
-use lib <packages>;
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 plan 191;

S02-literals/string-interpolation.t

@@ -1,5 +1,5 @@
 use v6;
-use lib 't/spec/packages';
+use lib $?FILE.IO.parent(2).add("packages");
 
 use Test;
 use Test::Util;

S02-magicals/78258.t

@@ -1,5 +1,5 @@
 use v6;
 
-use lib 't/spec/S02-magicals';
-use UsedEnv; # contains plan
+use lib $?FILE.IO.parent;
 
+use UsedEnv; # contains plan

S02-magicals/KERNEL.t

@@ -1,5 +1,5 @@
 use v6;
-use lib <t/spec/packages>;
+use lib $?FILE.IO.parent(2).add("packages");
 use Test;
 use Test::Util;
 

S02-magicals/args.t

@@ -1,5 +1,5 @@
 use v6;
-use lib 't/spec/packages';
+use lib $?FILE.IO.parent(2).add("packages");
 
 use Test;