xcalc: Changes to 'master'

[Alan Coopersmith]

 actions.c    |  169 +++++++++++++++++++++++++++++------------------------------
 configure.ac |    4 +
 math.c       |   79 ++++++++++++++++-----------
 xcalc.h      |   10 ++-
 4 files changed, 140 insertions(+), 122 deletions(-)

New commits:
commit 25454313c637f2b6983ba289deed96141cec8000
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Tue Jul 9 23:01:23 2013 -0700

    Mark functions noreturn as suggested by gcc -Wmissing-noreturn
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit de0e13ada857191a59c0e8f985d2317a7c41f43b
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Tue Jul 9 22:56:02 2013 -0700

    Rename "e" arguments to "ev" to avoid shadowing e() function
    
    Resolves many gcc warnings of the form:
    actions.c: In function ‘add’:
    actions.c:142:35: warning: declaration of ‘e’ shadows a global declaration
    actions.c:57:13: warning: shadowed declaration is here [-Wshadow]
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 40da34202dffa96197c6248a9d80894611e27921
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Tue Jul 9 22:53:07 2013 -0700

    Remove redundant redeclaration of ‘factorial’
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>

commit 1de8253f0ede02ec87d28b028de97da79adc12e2
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Tue Jul 9 22:49:21 2013 -0700

    Replace sprintf & strcpy calls with snprintf & strlcpy
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>